Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found in a Radio Electronics magazine from July 1982.
We found this circuit in an old American publication from the 1980s. Transistors can be...
The circuit shown uses the LM340 but applies to other regulators. We found this setting in...
This circuit generates signals that depend on resistors and capacitor, producing a tone in a...